给Xcode增加复制行、删除行快捷键

     运行：

sudo chmod   /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/IDETextKeyBindingSet.plist

    然后打开

/Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/IDETextKeyBindingSet.plist

1. 在Deletions下面增加：Delete Current Line，值为：

deleteToBeginningOfLine:, moveToEndOfLine:, deleteToBeginningOfLine:, deleteBackward:, moveDown:, moveToBeginningOfLine:

2. 在Insertions and Indentations下面增加：Duplicate Current Line，值为：

selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:

     然后重启Xcode，打开设置，Key Bindings，找到“Delete Current Line”和”Duplicate Current Line”这两项，设置为自己想要的快捷键。